Etymology
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sulk (v.)

1781, back-formation of sulky (adj.). Related: Sulked; sulking. As a noun from 1792.

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Definitions of sulk
1
sulk (v.)
be in a huff and display one's displeasure;
Synonyms: pout / brood
2
sulk (n.)
a mood or display of sullen aloofness or withdrawal;
stayed home in a sulk
Synonyms: sulkiness
From wordnet.princeton.edu